Simple Function Generator

 

 

Using a simple TL084 (or others) Op-amp, you can create Square, Triangular and Sine waveforms

 

The function generator workings:

 

The circuit first produces a triangle wave (op-amp one) and then intergrates that into a square wave using a second op-amp. To produce a sine wave, we shape the original triangle wave into a smoothed top and bottom using a diode and capacitor around a mosfet transistor. The circuit operated nicely at the various frequency ranges 20hz - 20khz and produced extremely sharp square waves and triangle waves.

 

Circuit: Click to view

 

The sine wave that was produced was not very good but probably ok for testing equipment. Please note that this circuit uses a floating ground point to allow the op-amps to swing below a set 0 point and so that they do not require a negative voltage power supply.

The frequency range can easily be changed by altering the 3 capacitor values connected to the frequency change switch.

 

Please do not reproduce anything contained within my website, as it maybe hazardous to your health unless you fully understand what you are doing.

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© Oliver Hunt 2006-2008